For the adventurous, sometimes dirtbagging, sometimes ladylike woman, there is one wardrobe staple that is a non-negotiable must: black leggings. It’s the one item in your closet (or dirty hamper in your van) that can effortlessly go from boulder fields to a downtown speakeasy. I’ve put holes in more pairs of cheap cotton leggings than I can count, so when tasc Performance contacted me with a challenge to test out their women’s apparel, I responded with an eager “game on!“

Here’s the thing about tasc: Everything is made with bamboo. My NOLA crop leggings are made with fabric concocted from 55% organic cotton, 35% viscose from bamboo, and 10% elastane. In normal people terms, that translates to: insanely soft, ridiculously comfortable, and impossibly form-fitting. The design strikes a perfect balance between athletic performance and stylishness.

As a gal who often wears leggings for days (really, weeks) on end without washing them, my first priority was to see how long I could go wearing tasc leggings before the butt area fell victim to the dreaded saggy-butt syndrome. My typical leggings will last a maximum of three days before they lose their hip-hugging shape.

These. leggings. will. not. get. saggy.

During my first test, I wore the leggings for four days straight, then took a few days off before wearing them for two more days before they needed to be washed (because I use my pants as napkins). Then, I just started wearing them with reckless abandon – from hikes around Colorado to airport hopping in San Diego. Ten+ days of wearing these leggings and they fit as snug as they did when I first put them on.

Excerpts from my e-mails to tasc about the leggings include snippets like, “HOW DO THESE LEGGINGS NOT STRETCH OUT IN THE BUTT? It almost makes me mad that I can’t get them to get saggy.” Also, “y’all crafted up some black magic.” Ladies, it just doesn’t make sense.

What makes tasc Performance apparel seem like a voodoo trick is the bamboo technology they perfected. By ditching the usual polyester material used in athletic clothing, they solved major issues like skin irritation, breathability, odor, and that whole sagging issue I keep bringing up. The bamboo also offers UPF 50+ protection from the sun and moisture wicking.

While I usually pay around $10 for leggings, the tasc leggings proved themselves worthy of the ~$50 investment. Their durability has taken me from climbing trips to city slicking without a single snag, and I am confident that I’ll have them in my closet for years.

Bonus points: tasc Performance make everything you need to stay cozy (and looking good) while adventuring. I also have the Intensity Sports Bra – which I liked, but didn’t totally love the style of, a pair of well-fitted socks that magically don’t make my feet stink, and a tank top (pictured above) that feels like I’m wrapped in a cloud every time I wear it. I’m currently coveting their grey Contour Fleece.

Disclosure: tasc Performance provided me with a complimentary package of clothing for gear-testing purposes – but as always, the opinions expressed here are 100% my own.